In this particular episode Bart and Homer are playing a boxing video game called Super Slugfest. Notice at 0:47
when Bart's character punches Homer's character .There is blood coming out of Homer's in-game character like how blood comes out of a MK character when you hit them. No other game at that time fictional or real has such a trait. Now notice at 1:14 where Bart'c character uppercuts Homer's character's head off. Looks familliar to what Johnny Cage does in MK1? This was in 1990. Then in1992 Mortal Kombat came out.
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